Okay, I have a 1994 Trans Am. Here are the speakers I am already going with for sure:
Focal Polyglass 165v components
Alpine Type R 1041-d 10" sub in a stealthbox

The focals RMS is 75w x 2 and a peak of 125w x 2
The Alpine RMS is 300w X 1 and a peak of 1000w X 2

I have decided to go with Phoenix Gold Octane amps to power this setup. I want to run two amps, one for the components and a mono for the sub. here are the amps I am trying to decide between. Please feel free to persuade me.

For the components:
R2.5:2 = 80w x 2 @ 4ohm stereo for 112.95
R4.0:2 = 125w X 2 @4 ohm stereo for 146.99

For the sub:
R5.0:1 = 500w X 1 @2ohm mono for 194.00
R8.0:1 = 400w X 1 @4ohm or 800w X 1 @2ohm mono for 244.50

please let me know guys. I don't know whether I need to run them closer to the RMS or the middle of peak? I am kind of leaning towards the R2.5:2 and the R5.0:1, but please let me know.